Samba suddenly fails

[remush]

We have been using samba at our community centre as a file server with a
bunch of shares on it for about 2 months, after lunch today, it started
giving error messages from win xp pro clients such as >the network name can
not be found< I've been getting other errors such as >permission denied
check you have valid access< I have made no changes to the smb.conf file in
weeks, no updates have been installed onto the system (debian 4)

I removed samba AND reinstalled it but nothing changed.

Here is a sample of my smb.conf file

[global]
workgroup = workgroup
netbios name = AdraFileServerold
map to guest = Bad User

[installfiles]
comment = Install Files
path = /home/data/installfiles
read only = no
guest ok = yes
force user = *****
force group = adratraining
nt acl support = no


Any suggestions would be appreceiated.
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